| 摘要 |
PURPOSE: A water-depth control device for a maximum stop frictional coefficient wet test is provided to control the depth of water at desired depth. CONSTITUTION: A uniform water-depth forming structure comprises a tractor(1), a trailer(2), a road surface(3), a water ponding member(4), a noncontact laser sensor(5), a measurement and transmission system(6), and an electric screw(7). The tractor and the trailer travel on the road surface. The water ponding member makes the proper amount of ponding by using an external water supply system on the road surface. The noncontact laser sensor is installed in a hitch unit connecting the tractor and the trailer and senses a distance. The measurement and transmission system receives data sensed by the sensor, thereby controlling the electric screw. The electric screw is minutely controls preset water-depth. [Reference numerals] (AA) Water depth
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